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设计手机网站公司,seo教程之关键词是什么,wordpress彩带背景,东兰县建设局网站文章目录 1.将整个view截图返回image：2.截取view的部分区域，返回image：3.旧方法：4.Tips参考： 1.将整个view截图返回image： 这些 api 已被废弃，所以需要判断 iOS 版本写两套代码： R…

文章目录

1.将整个view截图返回image：
2.截取view的部分区域，返回image：
3.旧方法：
4.Tips
参考：

1.将整个view截图返回image：

这些 api 已被废弃，所以需要判断 iOS 版本写两套代码：
Replace usage of UIGraphicsBeginImageContextWithOptions with UIGraphicsImageRenderer.
Replace usage of UIGraphicsGetImageFromCurrentImageContext with UIGraphicsImageRendererContext.currentImage.

Swift 版本：

/// 截图整个view
/// - Returns: image
func mooSnapshot() -> UIImage? {if self.window == nil {return nil}let scale = UIScreen.main.scalevar image: UIImage? = nil// 1. 创建绘图渲染格式if #available(iOS 10.0, *) {let format = UIGraphicsImageRendererFormat()format.scale = scaleformat.opaque = self.isOpaque// 2. 创建绘图渲染器let renderer = UIGraphicsImageRenderer(size: self.bounds.size,format: format)// 3. 绘制图image = renderer.image { context inlet success = self.drawHierarchy(in: self.bounds, afterScreenUpdates: true)print("draw success: \(success)")}} else {UIGraphicsBeginImageContextWithOptions(self.bounds.size, self.isOpaque, scale);let success = self.drawHierarchy(in: self.bounds, afterScreenUpdates: true)print("draw success: \(success)")image = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();}return image
}

OC版本：

- (UIImage * _Nullable)mooSnapshot {if (CGRectGetWidth(self.bounds) <= 0.0 || CGRectGetHeight(self.bounds) <= 0.0) {return nil;}if (!self.window) {return nil;}if (!self.superview) {return nil;}CGFloat scale = [UIScreen mainScreen].scale;UIImage *image = nil;if (@available(iOS 10.0, *)) {UIGraphicsImageRendererFormat *format = [[UIGraphicsImageRendererFormat alloc] init];format.scale = scale;format.opaque = NO;UIGraphicsImageRenderer *renderer = [[UIGraphicsImageRenderer alloc] initWithSize:self.bounds.sizeformat:format];image = [renderer imageWithActions:^(UIGraphicsImageRendererContext * _Nonnull rendererContext) {BOOL success = [self drawViewHierarchyInRect:self.bounds afterScreenUpdates:YES];NSLog(@"%p, Snapshot success: %@", self, @(success));}];} else {UIGraphicsBeginImageContextWithOptions(self.bounds.size, NO, scale);BOOL success = [self drawViewHierarchyInRect:self.bounds afterScreenUpdates:YES];NSLog(@"%p,  Snapshot success: %@", self, @(success));image = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();}return image;
}

2.截取view的部分区域，返回image：

Capture the frame area of the view.

Swift 版本：

import CoreGraphics
extension UIView {/// 截取view的部分区域/// - Parameter frame: 需要截取的区域/// - Returns: imagefunc mooSnapshotForFrame(_ frame: CGRect) -> UIImage? {guard let image = self.mooSnapshot() else { return nil }guard let cgImage = image.cgImage else { return nil }let scale = UIScreen.main.scale// 根据屏幕倍率将 frame 进行缩放let scaledRect = CGRectApplyAffineTransform(frame, CGAffineTransformMakeScale(scale, scale))// 根据 缩放frame 进行裁剪guard let scaledCGImage = cgImage.cropping(to: scaledRect) else { return nil }let returnImage = UIImage(cgImage: scaledCGImage)return returnImage}
}

OC 版本：

- (UIImage * _Nullable)mooSnapshotForFrame:(CGRect)frame {if (CGRectGetWidth(frame) <= 0.0 || CGRectGetHeight(frame) <= 0.0) {return nil;}UIImage *image = [self mooSnapshot];if (!image) {return nil;}CGFloat scale = [UIScreen mainScreen].scale;CGRect scaledRect = CGRectApplyAffineTransform(frame, CGAffineTransformMakeScale(scale, scale));CGImageRef cgImage = CGImageCreateWithImageInRect(image.CGImage, scaledRect);UIImage *returnImage = [UIImage imageWithCGImage:cgImage];CGImageRelease(cgImage);return returnImage;
}

以下就是将一个view的上半部分截取成image后展示如下：

在这里插入图片描述

3.旧方法：

func mooSnapshot() -> UIImage? {guard CGRectGetWidth(self.bounds) > 0.0 && CGRectGetHeight(self.bounds) > 0.0 else {return nil}UIGraphicsBeginImageContextWithOptions(self.bounds.size, false, 0.0)let success = self.drawHierarchy(in: self.bounds, afterScreenUpdates: true)print("draw success: \(success)")let image = UIGraphicsGetImageFromCurrentImageContext()UIGraphicsEndPDFContext()return image
}

Replace usage of UIGraphicsBeginImageContext with UIGraphicsImageRenderer.
Replace usage of UIGraphicsBeginImageContextWithOptions with UIGraphicsImageRenderer.
Replace usage of UIGraphicsGetImageFromCurrentImageContext with UIGraphicsImageRendererContext.currentImage.
UIGraphicsEndImageContext should only be used alongside UIGraphicsBeginImageContext[WithOptions].
这些旧的 api 已经被废弃了，用文章开头的 api 代替